25 October. Thus as a result of the battle, the Central Powers gained control of large stores of supplies and fuel as well as the vital railway between Constanța and Cernavodă. The offensive achieved a penetration depth of some 80 kilometers, or an average of 10 kilometers per an operational day – the highest of all major Bulgarian offensives during World War I. The field marshal felt free to transfer the 1st Sofia Infantry Division, the German 217th Division (without the 9th Reserve Regiment) and most of the German artillery to Svishtov where they would join General Kosch's Danube Army in preparation to cross the Danube and advance in conjunction with the German Ninth Army against Bucharest. The remainder of the forces in Dobrudja were returned to General Toshev's command and ordered to dig in on a new defensive line between Lake Taşaul and the village of Boasgic (today Dunărea). As early as 22 October General Zayonchkovsky was replaced as commander of the Russo-Romanian army by General Vladimir Viktorovich Sakharov who received fresh Russian divisions to replace the battered Romanian formations that had to be pulled back and reorganized. On 6 November the Russian army began closing in on the Bulgarian fortifications with superior forces in an attempt to break the Third Army's line. General Toshev had 45 infantry battalions, 45 batteries and 27 squadrons on the front line and an additional 5 battalions on garrison duties in the rear. A cause for great concern was also the large Russian forces that were concentrating on the left bank of the Danube which prompted the general to ask the Ottoman VI Corps, that had remained directly under the army group control after Cobadin, to be placed under his command. In view of the dangerous situation the field marshal satisfied Toshev's wish. By the middle of November, the battle along the entire line was raging with full force but the misunderstandings and conflicts between Mackensen and the Third Army's command were also peaking. Under German pressure the Bulgarian commander-in-chief, General Nikola Zhekov, relieved Toshev of his command and send him to Macedonia, where he initially served as governor. His place as commander of the Third Army was taken by Major General Stefan Nerezov. On 1 and 2 December, the Russians made a final attempt to break through but were again repulsed losing considerable numbers of men and material including two armored cars